DSS6NB32A471Q55B Datasheet, PDF (30/40 Pages) Murata Manufacturing Co., Ltd. – EMI Suppression Filters (Lead Type EMIFIL)

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Noise Suppression Effect of VFR/VFS Series
Continued from the preceding page.
cNoise Absorption Effect of EMIGUARDr (VFS9V)
Type of Filter
EMI Suppression Effect
without EMIGUARDr
: 200V/div
: 10ns/div
100
90
80
20
10
0%
Description
Waveform when EMIGUARDr is not
used.
(Surge from a noise simulator.)
with EMIGUARDr
D
223S
12-22
: 200V/div
Waveform after the noise passed
: 10ns/div
100
through EMIGUARDr. Little noise is
90
80
recorded.
20
10
0%
cComparative Data (VFS9V)
1. Absorption of quick-rising, high-frequency noise (10ns/div, 100V/div)
Type of Filter
EMI Suppression Effect
50ns
Without Filters
Conventional varistor
Noise wave applied
100
90
80
20
10
0%
Two-terminal capacitor
100
(with varistor function)
90
80
20
10
0%
VFS9V
100
90
80
20
10
0%
28
Description
As with the two-terminal capacitor
The two-terminal capacitor is influenced
by lead line inductance, leaving behind
some of the rising and falling edges.
The residual noise can cause the
system to malfunction.
The three-terminal structure eliminates
most of the lead line inductance. This
allows VFS9V to completely absorb the
rising and falling edges of the applied
pulses.
Continued on the following page.